Trolls can be described as tall, short, thin, fat, hairy, ugly, good looking (Okay that one might be a stretch), hairless, dumb, smart, big thugs, smart thinkers. . . Yeah so pretty much it depends on which myth you are going by. Different cultures believe different things about different trolls. If you've seen Harry Potter, you might think all trolls are big, ugly and stupid. If you have played Skylanders: Spyros Adventures, (Yes I finally played a video game!) than trolls can appear a little more smart and they have chosen a side!
Trolls are so different between different cultures that seriously no one would know if you created an entire new species of Troll. There are so many already!